matrix-docker-ansible-deploy/roles/matrix-server/templates/systemd/matrix-mailer.service.j2

[Unit]
Description=Matrix mailer
After=docker.service
Requires=docker.service

[Service]
Type=simple
ExecStartPre=-/usr/bin/docker kill matrix-mailer
ExecStartPre=-/usr/bin/docker rm matrix-mailer
ExecStart=/usr/bin/docker run --rm --name matrix-mailer \
			--log-driver=none \
			--network={{ matrix_docker_network }} \
			--env-file={{ matrix_environment_variables_data_path }}/env-mailer \
			{{ matrix_docker_image_mailer }}
ExecStop=-/usr/bin/docker kill matrix-mailer
ExecStop=-/usr/bin/docker rm matrix-mailer
Restart=always
RestartSec=30

[Install]
WantedBy=multi-user.target